* {
    padding: 0;
    margin: 0;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: rgb(243, 230, 241);
}

.shell {
    width: 90%;
    height: 700px;
    display: flex;
}

.box {
    flex: 1;
    overflow: hidden;
    transition: .5s;
    margin: 0 20px;
    box-shadow: 10px 10px 20px rgba(0, 0, 0, .5);
    border-radius: 20px;
    border: 10px solid #fff;
    background-color: #fff;
}

.box>img {
    width: 200%;
    height: 85%;
    object-fit: cover;
    transition: .5s;
}

.box>span {
    font: 200 45px '优设标题黑';
    text-align: center;
    height: 15%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.box:hover {
    flex-basis: 40%;
}

.box:hover>img {
    width: 100%;
    height: 100%;
}